Die stock



Feb. 17,1942. (3. w. SHAFER. 2,273,598

I DIESTOCK Filed July 15, 1940 s sheet-she t 1 Z/- Z3 Z0 ,2 l 5a 50 H l 5/ INVENTOR.

Feb. 17, 1942. I c. w. SHAFER 2,273,598

I DIE STOOK Filed July 15, 1940 s Sheets-Sheet 2 INVENR'DR. Him wffigzaabr Patented Feb. 17, 1942 DIE STOCK C r n e Sha er Wa n, Qh a. a si ns to B av ne 09 5 11w, Warr n-9th a ce n at qn qf Ohio Appl ca n ly 5, 1940., Se Qr 345 553- 6- C aim (Q lQ-lfi-i) This invention relates to a die stock of: the type employing a fixed. or buttonhead die, such as commonly used for the threading of bolts. One of the disadvantages of such type of die, particularlyif mounted on a ratchet head having a guiding sleeve, has been the difficulty of clearing the chips. The. chips have tended to clog in the die, adjacent to the active face thereof, resulting in a ragged out. The object of my invention is to provide a guiding head carrying the button die in such mannerthat the chips will readily clear from the bolt being threaded. I efiect this by mounting the button die in one end or a tubular head, the other end portion of which constitutes the pipe guide, and is acted on externally by means to rotate the head, while between the driving portion and the die-carrying portion, the head has lateral openings which lead directly to the region at the inner face of the die.

These openings are formed in a peculiar manher, as hereinafter explained, so that all chips are effectively cleared. The openings also provide for the insertion of a point of an oil can to oil the teeth of the die and the bolt adjacent to a the die.

My invention is hereafter more fully explained in connection with the accompanying drawings which show a preferred embodiment thereof.

, In the drawings, Fig, 1 is a plan of a ratchet die stock embodying my invention, Fig. 2 is a section of the die stock in the plane indicated by the line 2-2 on Fig. 1;, Fig. 3 is a side elevation, partly broken away of the die stock looking from the left hand end of- Figs. 1 and 2. Fig, '4 is a -1 hor-izontal section through the'clearance openings of the die head looking upward, as indicated by the line 4-4 of Fig. 3'. Fig.5 is a p rspective of the die stock with the handle broken away andthe pawl-carrying portion hidden from iew. Fig. 6 is a horizontal section looking down, on the line 6-6 onFig. 3. Fig; 7 is an axial section through two opposed cle rance openings, as indicated by the line 1-'l on Fig. 6, g j

As shown in each of the views, Ill indicates the tubular body of the die stock comprising a head portion H, a guiding and driving portion l2, and an intermediate open connecting portion [3.

The head portion H on the frame has at its end a cylindrical recess in which sits the button die 20 formed in the usual manner of a boltthreading die. This die is held in place in the head by suitable set screws, as, for instance, the set screws 30 (Fig. 2) having angular sockets 3| for the insertion of a wrench rod. These set screws are pointed at their. inner ends and seat in substantially conical recesses 2 1 in the periphery of the die.

The driving end guiding portion 12 of the die head is a tubular member having in its interior adjacent the end, a guiding bore [5 which corre-. sponds tothe diameter of the bolt to be threaded.

To rotate the head, I prefer to provide an oscillatory operating device carrying a pawl which coacts with an annular row of teeth on the tubular body. This is the form shown in the drawings where the annular row of teeth H5 on the exterior of the body have substantially radial faces, as indicated in dotted lines in Fig. 1.

Above the toothed portion is an outward flange I! which limits the position of the ratchet driving device which coacts with teeth I6.

Between the tubular driving portion of the head just described and the portion which carries the die is the intermediate connecting portion l3 which comprises two diametrically opposite arcuate portions separated by openings IS. The openings l8 are of'special form to provide for the chips" clearance directly from the teeth of the die,

A and will now be described.

Each opening I8 extends from the inwardly converging edge of one connecting member I3 to the edge of the other member l3. The arcuate extent of the opening is several times that of the connection 13, the arcuate length of the openingas shown being about three times that of the connecting member,

At eachend, each opening I8 is formed in the manner of a cylindrical surface inclined toward the die as such portion of the opening passes inwardly nearly radially as indicated particularly at I9 in'Figs. 2, 6 and '7. The two cylindrical walls l9 are merged with the top and bottom of.

the intermediate portion of the elongated slot l8.

'- The bottom wall of this slot starts as a flat surface [4 which leads from the inner faces of the arcuate connecting portions [3 and then passes into the inclined wall H, which, with the die stock in the position of Fig. 2, forms the top of the driving portion of the die stock.

The four substantially cylindrical inclined portions l9 as indicated in Fig. '7, and by broken lines in Fig. 6, lead directly to the inner face of the die in the region where the first acting teeth engage the bolt in the act of being threaded.

Asindicated by'the bolt A, Fig. 7, the die 29 is so located in the head that its openings 22 substantially register with the inner ends of the cy-. lindrical end portions of the openings [8, as shown also in Fig. 4.

It results from the construction described that the chips cut by the teeth 23 of the die have a ready passage either directly into the opening l9, l8, or first into the die openings 22 and then through the cylindrical portions l9 and the adjacent elongated portion I8 directly to the exterior. This is illustrated in Fig. 7 where chips B are shown as passing from the cutting face to the exterior of the die stock.

These same clearance openings, leading from the die openings adjacent the cutting teeth, provide also for the insertion of the spout of an oil can to oil the teeth and bolt as the cutting progresses, as indicated by the oil can C in Fig. '7.

The peculiar formation described, accordingly, not only makes the device automatically clearing of the chips cut with the die but enables the bolt and the teeth of the chaser, especially those teeth first acting on the bolt, where the trouble has heretofore occurred, to be maintained properly lubricated with the result that an accurate thread may be rapidly cut.

To rotate the die carrying head to effect the threading, I prefer to provide an operating device having a ring portion to surround the toothed portion of the barrel and having an operating handle and the ratchet pawl to engage such teeth. This is the construction illustrated in Figs. 1 and 2, where 40 indicates the ring-like body, and 4| an integral radial extension thereof having an internally threaded socket 42 adapted to receive a threaded handle 59. This member 40 also carries a ratchet pawl to engage the teeth l6.

As shown, the ring-like member 40 has an integral radial sleeve portion 45 which carries the pawl 60 acting on the ratchet teeth. This pawl is a cylindrical block slidably mounted in the bore of the sleeve and having at its inner end a tooth 6| terminating substantially on the diameter of the block. This tooth has an abrupt face adapted to engage the radial face of any of the teeth l6, and has an inclined face adapted to overhang the adjacent tooth as indicated by dotted lines in Fig. 1. The pawl is shown as having a shank 63 extending out of the socket 45 and carrying an operating knob 65. A compression spring 66 in the sleeve bears at one end against the pawl and at the other end against a stop or head in the sleeve and tends to maintain the pawl in coaction with the teeth IS. The pawl shank 63 carries a pin 61 which normally occupies a pair of diametrically opposed notches 68 in the outer end portion of the sleeve.

If the pawl shank is pulled outwardly by a manual engagement of the knob 65 and given a one-quarter turn, the pin 61 will rest on the extreme end of the sleeve 45, and hold the pawl free from the die head, so that the driving frame i may be readily removed from the die carrying head.

If on the other hand, when the pawl is withdrawn, the knob 65 is given a half rotation from that shown in Fig. 1, and then returned to position, the pawl tooth 6| will face in the opposite direction, so that then the reciprocation of the handle 50 may drive the die-carrying head in the opposite direction.

It will be understood that the teeth l6, are recessed in the die stock barrel; that is, to say, the spaces between the teeth are closed at their opposite ends by the material of the barrel as shown in the Fig. 2. so that when the pawl is in engagement the edge of its tooth prevents the removal of the handle frame. The faces of the teeth are set back slightly from the face of the barrel beyond the teeth as shown in Fig. 2, so that even as the pawl slides over the face of a tooth in the backward movement of the handle, it does not free the handle frame from the barrel. To so free the frame the pawl must be pulled further out by its knob 65.

It will be seen, from the description given, that my die-carrying head, though peculiar in form, is a very simple device comprising preferably one single integral steel casting. It receives a cutting die of standard make and effectively holds it in position and enables its ready rotation while the guiding sleeve coacting with the bolt being threaded maintains the die exactly perpendicular to the bolt axis. These features are associated with clearance passageways which as explained, immediately discharge the chips as formed and prevent any clogging at the teeth.

I claim:

1. In a die stock, the combination of a button die, a tubular head having recess in one end adapted to receive the die, said head having an elongated barrel beyond the inner face of the die, inclined openings through the wall of the barrel leading from the inner face of the die to the exterior in a region beyond the die.

2. In a die stock, the combination of a tubular barrel having a circular recess in one end, a button die within the recess, said tubular head extending for a considerable distance beyond the inner face of the die and having on its exterior adjacent the far end means to rotate the head, there being formed through the head in the intermediate regions between the die and the driving portion of the head arcuate openings which terminate in substantially cylindrical inclined surfaces leading from the die to exterior of the head, the die having four sets of cutting teeth separated by four openings into the body of the die and the four inclined substantially cylindrical passage-ways through the wall of the head substantially registering with the openings in the die, whereby chips within the die spaces may pass directly to the exterior of the head.

3. The combination of a button die having four sets of cutting teeth with four spaces between adjacent sets communicating with the axial space between the faces of the teeth, a round head in the form of a barrel having a recess at one end in which the die seats, and having a driving portion adjacent the other end and an intermediate portion comprising two arcuate posts connecting the two portions first mentioned and leaving two arcuate spaces between them, there being an open space clear across the interior of the head from one arcuate space to the otherto provide for chip clearance of the die, the arcuate spaces through the wall of the head having curved ends which define openings leading in an inclined direction to the spaces within the die, said arcuate openings having bottom walls which are inclined inwardly in the direction toward the die and at their inner edges merge with the bottom of the internal open space between the die and the driving end of the head.

4. In a die stock, the combination of a tubular barrel having a recess at one end, a button die seated in said recess, the barrel being formed with a reduced bore adjacent the other end adapted to engage the article being threaded and thereby guide the die, the exterior of the barrel adjacent the latter end being formed with an annular row of teeth, a ratchet driving device occupying an annular rabbet about the barrel, the body of the head overhanging the driving device in the intermediate region of the head, such overhanging portion having an exposed surface inclining inwardly toward the axis and in the general direction toward the inner face of the die, there being an open space of substantial extent between the inner face of the die and that portion of the barrel which receives the ratchet driving mechanism, the latter portion of the body being connected with the annular portion carrying the die by two arcuate posts leaving betwen them arcuate slots leading from the inner face of the die to the exterior of the head.

5. In a die stock, the combination of a button die, a tubular head having recess in one end adapted to receive the die, said head having an elongated barrel beyond the inner face of the die terminating in a portion having an axial openended bore adapted to form a guide for the article being threaded, elongated openings through the wall of the barrel beyond the die, said openings being inclined outwardly and longitudinally from the openings in the die between its sets of teeth toward the guiding portion of the barrel.

6. In a die stock, the combination of a tubular barrel having a cylindrical recess in one end with an inward flange at the base of the recess, the recess being open for the full diameter of the cylinder at the other end, a button die within the recess seated against the flange, a screw mounted in the wall of the recess to engage the periphery of the die, said tubular head extend- 

